US8233363B2 - Method of controlling recording operation and optical disc drive employing the method - Google Patents
Method of controlling recording operation and optical disc drive employing the method Download PDFInfo
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- US8233363B2 US8233363B2 US12/844,933 US84493310A US8233363B2 US 8233363 B2 US8233363 B2 US 8233363B2 US 84493310 A US84493310 A US 84493310A US 8233363 B2 US8233363 B2 US 8233363B2
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- recording
- disc
- wst
- owc
- parameters related
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1263—Power control during transducing, e.g. by monitoring
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1267—Power calibration
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00456—Recording strategies, e.g. pulse sequences
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
Definitions
- the following description relates to a method of controlling a disc drive and a disc drive employing the same, and more particularly, to a method of controlling a recording operation in an optical disc drive to improve recording quality and an optical disc drive employing the method.
- discs used as recording media for optical disc drives may be categorized into playback only optical discs, such as compact disc-read only memory (CD-ROM), one-time recordable optical discs, such as CD-recordable (CD-R), and rewritable optical discs, such as CD-rewritable (CD-RW), based on an intended purpose.
- CD-ROM compact disc-read only memory
- CD-R CD-recordable
- CD-RW rewritable optical discs
- CD-RW compact disc-read only memory
- CD-R CD-recordable
- CD-RW rewritable optical discs
- CD-RW compact disc-read only memory
- CD-R compact disc-read only memory
- CD-R CD-recordable
- CD-RW rewritable optical discs
- a method of controlling a recording operation comprising: setting recording power and parameters related to the generation of recording pulses by successively performing: an optimum power controlling (OPC) process for adjusting recording power; and an optimum write strategy (WST) tuning control (OWC) process for adjusting parameters related to the generation of recording pulses; and performing data recording based on the set recording power and the set parameters related to the generation of recording pulses.
- OPC optimum power controlling
- WST optimum write strategy tuning control
- the method may further include that the OPC process and the OWC process are performed before data is recorded.
- the method may further include that the OPC process and the OWC process are successively performed prior to or during a recording operation.
- the method may further include that the data recording is temporarily stopped, recording quality is evaluated, and the OPC process and the OWC process are successively performed at every initially set interval.
- the method may further include that the initial WST, which is initially set before recording power and parameters related to the generation of recording pulses are adjusted, is determined based on the identification (ID) of a disc to which data is to be recorded.
- ID the identification
- the method may further include that the OWC process is performed only when recording quality is below a critical recording quality.
- the method may further include that the recording quality is evaluated based on error rate or jitter detected by reproducing signals recorded in a disc.
- the method may further include that parameters related to recording power are adjusted based on a result of a comparison between recording power calculated based on a reproduced signal and target recording power during the OPC process.
- the method may further include that the recording power is calculated by using a factor indicating the vertical symmetry of the waveform of a reproduced signal, which is proportional to the intensity of light reflected by a disc.
- the method may further include that only parameters related to timings of recording pulses are adjusted when the OWC process is performed during data recording.
- the method may further include that the OWC process is performed in correspondence to a recording speed.
- a computer-readable storage medium having recorded thereon a computer program for implementing a method, comprising: setting recording power and parameters related to the generation of recording pulses by successively performing: an optimum power controlling (OPC) process for adjusting recording power; and an optimum write strategy (WST) tuning control (OWC) process for adjusting parameters related to the generation of recording pulses; and performing data recording based on the set recording power and the set parameters related to the generation of recording pulses.
- OPC optimum power controlling
- WST optimum write strategy tuning control
- an optical disc drive comprising: a memory configured to store information regarding recording power and optimum write strategy (WST); and a system control unit configured to control the optical disc drive to: set recording power and parameters related to the generation of recording pulses by successively performing, prior to or during a recording operation: an optimum power controlling (OPC) process for adjusting recording power; and the WST tuning control (OWC) process for adjusting parameters related to the generation of recording pulses; and perform data recording based on the set recording power and the set parameters related to the generation of recording pulses.
- WST optimum power controlling
- the optical disc drive may further include that the system control unit comprises: a WST tuning control module configured to adjust parameters related to the generation of recording pulses based on recording quality; and an OPC module configured to compare recording power calculated based on a reproduced signal to target recording power and adjust recording power based on a result of the comparison.
- the system control unit comprises: a WST tuning control module configured to adjust parameters related to the generation of recording pulses based on recording quality; and an OPC module configured to compare recording power calculated based on a reproduced signal to target recording power and adjust recording power based on a result of the comparison.
- the optical disc drive may further include that first group WST information is initially tuned based on one or more of: universal disc identifications (IDs), second group WST information regarding non-universal discs, and default WST information that are classified and stored in the memory.
- IDs universal disc identifications
- second group WST information regarding non-universal discs and default WST information that are classified and stored in the memory.
- the optical disc drive may further include that, in response to WST information corresponding to a disc ID read out from a disc to which data is to be recorded not being stored in the memory, the system control unit is further configured to: read out default WST information from the memory; and initially set parameters related to the generation of recording pulses.
- the optical disc drive may further include that the OWC process is performed only when recording quality is below a critical recording quality.
- the optical disc drive may further include that the recording quality is evaluated based on error rate or jitter detected by reproducing signals recorded in a disc.
- the optical disc drive may further include that parameters related to recording power are adjusted based on a result of comparison between recording power calculated based on a reproduced signal and target recording power during the OPC process.
- the optical disc drive may further include that the recording power is calculated by using a factor indicating the vertical symmetry of the waveform of a reproduced signal, which is proportional to the intensity of light reflected by a disc.
- the optical disc drive may further include that only parameters related to timings of recording pulses are adjusted when the OWC process is performed during data recording.
- the optical disc drive may further include that the OWC process is performed in correspondence to a recording speed.
- FIG. 2 is a flowchart illustrating an example of a method of controlling a recording operation.
- FIG. 4 is a flowchart illustrating an example of the skipping OWC (SOWC) process shown in FIG. 2 .
- SOWC skipping OWC
- FIG. 6A is a diagram illustrating an example of reproduced signal waveforms.
- FIG. 6B is a graph illustrating an example of a relationship between values of ⁇ and recording power.
- the disc 110 which is a recording medium that may be used in an optical disc drive, may be, for example, a compact disc (CD), a digital versatile disc (DVD), a Blu-ray Disc (BD), or the like.
- CD compact disc
- DVD digital versatile disc
- BD Blu-ray Disc
- the pickup 120 may project a laser beam according to optical driving signals generated by the optical driving unit 140 onto the disc 110 and detecting optical signals reflected from the disc 110 .
- the R/F signal processor 130 generates a focus error signal, a tracking error signal, and a signal processing signal by combining signals detected by the pickup 120 . Then, the R/F signal processor 130 filters and equalizes the signal processing signal, converts the equalized and standardized signal processing signal into a binary signal, and outputs the binary signal to the DSP 160 .
- the optical driving unit 140 In a recording mode, the optical driving unit 140 outputs a recording pulse, which is an optical driving signal based on an input signal, according to a recording power value and parameters related to the generating of the recording pulse.
- the power value may be determined through an optimum power controlling (OPC) process for controlling recording power.
- the parameters related to the generating the recording pulse may be determined through a write strategy (WST) tuning control process.
- WST write strategy
- the optical driving unit 140 In a playback mode, the optical driving unit 140 outputs an optical driving signal for generating laser power at a constant level.
- the encoder 150 converts data, which was converted to data in a particular recording format by the DSP 160 , to a bit stream and outputs the bit stream to the optical driving unit 140 .
- the servo control unit 190 generates a driving voltage for driving an actuator of the pickup 120 to control the pickup 120 in a horizontal direction or a vertical direction by using a tracking error signal or a focus error signal.
- the servo control unit 190 also generates a driving voltage for driving the sled motor 220 to move the pickup 120 to a target track, and generates a spindle motor control signal for controlling the spinning speed of the disc 110 .
- the driving unit 200 generates a driving current signal for driving the spindle motor 210 and sled motor 220 based on a control signal generated by the servo control unit 190 .
- the driving unit 200 also generates a driving current for driving the actuator of the pickup 120 to control focusing and tracking of an optical lens of the pickup 120 .
- the memory 170 may be a non-volatile memory, such as a flash memory, for example. Other suitable storage media may be used as well.
- First group WST information initially tuned based on universal disc identifications (IDs), second group WST information regarding non-universal discs, and default WST information may be classified and stored in the memory 170 .
- the first group WST information may include write strategies initially tuned with respect to IDs of generally used discs, respectively, during the manufacturing process of a disc drive.
- the second group WST information may include write strategies tuned with respect to discs, which are not generally used, respectively, through an optimum WST tuning control (OWC) process, in which the second group WST information is classified according to IDs of the discs and are stored in the memory 170 .
- WOC WST tuning control
- storage space in which WST information with respect to three types of non-universal discs may be stored, is allocated in the memory 170 .
- a WST information tuned through an OWC process with respect to a non-universal disc is overwritten to a region, in which the least frequently accessed WST information with respect to a non-universal disc is stored, based on the frequencies of accessing the WST information.
- FIG. 5 shows an example of WST information for generating a recording pulse 103 with respect to a 6T signal 101 .
- the WST information may include power-related parameters and timing-related parameters.
- the power-related parameters may include a peak power P C , a bias power P B , a cooling power P A , and an overdrive power OD.
- the timing-related parameters may include a front overdrive width Ttop, a rear overdrive width T LP , a rising edge delay dTtop, a falling edge delay dTlp.
- the system control unit 180 controls overall operations of the optical disc drive and identifies type and ID of a loaded disc. As shown in FIG. 2 , the system control unit 180 sets recording power and parameters related to the generation of recording pulses by successively performing an OPC process for adjusting recording power and an OWC process for adjusting parameters related to the generation of recording pulses prior to or during a recording operation. The system control unit also controls the optical disc drive to perform data recording based on the set recording power and the set parameters related to the generation of recording pulses.
- the system control unit 180 includes a WST tuning control module 180 - 1 and a OPC module 180 - 2 .
- the WST tuning control module 180 - 1 may perform optimization of WST, in which parameters related to the generation of recording pulses are set with respect to IDs of discs.
- the OPC module 180 - 2 may adjust and optimize recording power with respect to a disc to which data is to be recorded.
- the WST tuning control module 180 - 1 and the OPC module 180 - 1 are included in the system control unit 180 .
- the subject matter of this application is not limited thereto, and the WST tuning control module 180 - 1 and the OPC module 180 - 2 may be independent components separate from the system control unit 180 .
- FIG. 2 illustrates an example of a method of controlling a recording operation.
- an optical disc drive determines whether a write command is generated or not in operation 201 .
- a write command may be either received from a host apparatus (not shown) or generated by the system control unit 180 based on a function selecting signal received via a user input unit for inputting keys (not shown).
- WST information corresponding to a disc ID read out from a disc to which data is to be recorded
- a first group WST information initially tuned based on IDs of universal discs initially tuned WST information corresponding to the ID of the disc is read out from the memory 170 and an initial WST to be applied to an optical disc drive is set.
- WST information corresponding to a disc ID read out from a disc to which data is to be recorded is included in a second group WST information tuned based on IDs of non-universal discs
- WST information corresponding to the ID of the disc is read out from the memory 170 and an initial WST to be applied to an optical disc drive is set.
- WST information corresponding to a disc ID read out from a disc to which data is to be recorded is not included in the first group WST information initially tuned based on IDs of universal discs and the second group WST information tuned based on IDs of non-universal discs, default WST information is read out from the memory 170 and an initial WST to be applied to an optical disc drive is set.
- an OPC process is performed in operation 203 .
- parameters related to recording power are adjusted by recording test data in the test region of the disc 110 based on the initial WST set in operation 202 , reproducing the recorded test data, and comparing recording power calculated based on a reproduced signal to target recording power.
- recording power may be calculated from a value of ⁇ , which is a factor indicating the vertical symmetry of the waveform of a reproduced signal, and in the waveform of a reproduced signal shown in FIG. 6A , the value of ⁇ is defined as defined below in Equation 1.
- ⁇ ( A ⁇ B )/( A+B ) [Equation 1]
- A indicates the magnitude of the positive peak of a reproduced signal
- B indicates the magnitude of the negative peak of the reproduced signal
- FIG. 6B an example of the relationship between a value of ⁇ and recording power P is shown in FIG. 6B .
- the relationship between a value of ⁇ and recording power P is a linear relationship. Therefore, recording power may be obtained from a graph as shown in FIG. 6B by calculating a value of ⁇ .
- parameters related to recording power may be adjusted by comparing a calculated value of ⁇ and a target value of ⁇ .
- an OWC process is performed in operation 204 .
- FIG. 3 illustrates an example of an OWC process. Referring to FIG. 3 , an OWC process in operation 204 shown in FIG. 2 is described in detail.
- the initial value of a counter N (not shown) integrated in the system control unit 180 is set to 1 in operation 301 ).
- the counter N indicates information regarding the recording speed of an optical disc drive.
- the counter N may be used as information for selecting a particular recording speed between the minimum recording speed and the maximum recording speed.
- N_last may indicate [(an N value indicating the maximum recording speed)+1]
- a value between 1 and N_last ⁇ 1 indicates a particular recording speed between the minimum recording speed and the maximum recording speed.
- Recording quality is evaluated by reproducing recorded data after spinning the disc 110 at a recording speed indicated by the value of the counter N and recording test data in the test region of the disc 110 based on an initially set or adjusted WST in operation 304 ).
- recording quality may be determined based on error rate or jitter.
- subject matter of the present application is not limited thereto, and other types of factors may also be used to evaluate recording quality.
- WST tuning with respect to the corresponding recording speed is terminated, and a value 1 is added to the value of the counter N (operation 308 ).
- WST information with respect to the corresponding recording speed is temporarily stored in a register (not shown) integrated in the system control unit 180 .
- the operation in operation 302 is performed after the operation in operation 308 is performed.
- WST tuning retry is performed in operation 307 .
- operation 304 is performed based on the adjusted WST.
- a disc with respect to which OWC process is performed is a universal disc or not inoperation 309 .
- the value of the counter N is identical to the value of N_last only when OWC process is performed with respect to all set recording speeds. If the ID information read out from the disc 110 is included in IDs corresponding to initially tuned first group WST information stored in the memory 170 , the disc 110 is determined as a universal disc. Otherwise, the disc 110 is determined as a non-universal disc.
- the disc 110 is a non-universal disc
- an OWC process is performed, so that WST information temporarily stored in the register is stored in the memory 170 inoperation 310 .
- WST information corresponding to the particular ID is updated.
- WST information with respect to the ID of the non-universal disc with respect to which the OWC process is performed is stored in the storage region of the memory 170 allocated to the second group WST, when available space of the storage region is enough. However, if available space of the storage region of the memory 170 is not enough, WST information with respect to the ID of the non-universal disc with respect to which the OWC process is performed is overwritten in the region in which WST information with respect to the least frequently accessed ID of a non-universal disc is stored.
- the OWC process in operation 204 of FIG. 2 may be performed.
- recording data in the data region of the disc 110 begins in operation 205 .
- an OPC process is performed based on initially set conditions.
- An OPC process performed based on initially set conditions after temporarily stopping data recording while data is recorded in the data region of the disc 110 will be referred to hereinafter as a skipping OPC (SOPC) process.
- the initially set conditions may be set to perform a SOPC process at every predetermined interval, for example.
- SOPC skipping OPC
- the adjustment of recording power may be performed based on a value of ⁇ calculated from reproduced signals as described above with respect to operation 202 .
- a skipping OWC (SOWC) process is performed in operation 207 ).
- An OWC process performed based on initially set conditions after temporarily stopping data recording while data is recorded in the data region of the disc 110 may also be referred to as a SOWC process.
- FIG. 4 illustrates an example of an SOWC process.
- the system control unit 180 determines whether a SOWC process needs to be performed in operation 401 ).
- a SOWC process may be set to be performed at the same intervals as something and successively after a SOPC process.
- a SOWC process and a SOPC process may be performed at different intervals.
- recording quality may be determined based on error rate or jitter. However, embodiments are not limited thereto, and other types of factors may also be used to evaluate recording quality.
- a WST tuning process is performed in operation 405 .
- parameters related to the generation of recording pulses are adjusted, so that recording quality exceeds the critical recording quality.
- only parameters related to timings of recording pulses may be adjusted to reduce a period of time elapsed for performing the WST tuning process.
- the SOWC process in operation 207 of FIG. 2 may be performed.
- the deterioration of recoding quality with respect to non-authentic discs and non-universal discs may be reduced or prevented by setting up recording power and parameters related to the generation of recording pulses by successively performing an OPC process for adjusting recording power and an OWC process for adjusting parameters related to the generation of recording pulses prior to or during a recording operation and by performing data recording based on the set recording power and the set parameters related to the generation of recording pulses. Furthermore, recording characteristic deviations based on factors, such as deviations of parts of an optical disc drive, adjustments, temperatures, or the like, may be reduced, so that recording quality may be improved.
- the processes, functions, methods and/or software described above may be recorded, stored, or fixed in one or more computer-readable storage media that includes program instructions to be implemented by a computer to cause a processor to execute or perform the program instructions.
- the media may also include, alone or in combination with the program instructions, data files, data structures, and the like.
- the media and program instructions may be those specially designed and constructed, or they may be of the kind well-known and available to those having skill in the computer software arts.
- Examples of computer-readable media include magnetic media, such as hard disks, floppy disks, and magnetic tape; optical media such as CD-ROM discs and DVDs; magneto-optical media, such as optical discs; and hardware devices that are specially configured to store and perform program instructions, such as read-only memory (ROM), random access memory (RAM), flash memory or the like.
- Examples of program instructions include machine code, such as produced by a compiler, and files containing higher level code that may be executed by the computer using an interpreter.
- the described hardware devices may be configured to act as one or more software modules in order to perform the operations and methods described above, or vice versa.
- a computer-readable storage medium may be distributed among computer systems connected through a network and computer-readable codes or program instructions may be stored and executed in a decentralized manner.
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Abstract
Description
β=(A−B)/(A+B) [Equation 1]
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KR1020090075431A KR101339428B1 (en) | 2009-08-14 | 2009-08-14 | Recording control method and optical disc drive using the same |
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6563775B2 (en) * | 2000-05-31 | 2003-05-13 | Ricoh Company, Ltd. | Optical disk unit |
KR20040002366A (en) | 2002-06-29 | 2004-01-07 | 주식회사 히타치엘지 데이터 스토리지 코리아 | Optimal Recording method onto a Recording Medium |
US20050185537A1 (en) * | 2004-01-20 | 2005-08-25 | Masaki Ninomiya | Evaluation method, recording method, program and recording medium, and optical disk apparatus |
US20060239166A1 (en) | 2005-04-20 | 2006-10-26 | Chih-Ching Yu | Method of determining a write strategy |
KR100723536B1 (en) | 2006-01-25 | 2007-05-30 | 삼성전자주식회사 | Optical disc apparatus and method for writing thereto |
KR20080060464A (en) | 2006-12-27 | 2008-07-02 | 주식회사 히타치엘지 데이터 스토리지 코리아 | Control method of writing power in optical disc driver |
US20090141601A1 (en) * | 2007-11-29 | 2009-06-04 | Hitachi-Lg Data Storage, Inc. | Recording method and optical disc apparatus |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004110915A (en) * | 2002-09-17 | 2004-04-08 | Ricoh Co Ltd | Method and device for controlling write power |
JP2008016164A (en) * | 2006-07-10 | 2008-01-24 | Teac Corp | Optical disk device and recording strategy determination method |
-
2009
- 2009-08-14 KR KR1020090075431A patent/KR101339428B1/en not_active IP Right Cessation
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Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6563775B2 (en) * | 2000-05-31 | 2003-05-13 | Ricoh Company, Ltd. | Optical disk unit |
KR20040002366A (en) | 2002-06-29 | 2004-01-07 | 주식회사 히타치엘지 데이터 스토리지 코리아 | Optimal Recording method onto a Recording Medium |
US20050185537A1 (en) * | 2004-01-20 | 2005-08-25 | Masaki Ninomiya | Evaluation method, recording method, program and recording medium, and optical disk apparatus |
US20060239166A1 (en) | 2005-04-20 | 2006-10-26 | Chih-Ching Yu | Method of determining a write strategy |
KR100723536B1 (en) | 2006-01-25 | 2007-05-30 | 삼성전자주식회사 | Optical disc apparatus and method for writing thereto |
KR20080060464A (en) | 2006-12-27 | 2008-07-02 | 주식회사 히타치엘지 데이터 스토리지 코리아 | Control method of writing power in optical disc driver |
US20090141601A1 (en) * | 2007-11-29 | 2009-06-04 | Hitachi-Lg Data Storage, Inc. | Recording method and optical disc apparatus |
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KR20110017782A (en) | 2011-02-22 |
US20110038240A1 (en) | 2011-02-17 |
KR101339428B1 (en) | 2013-12-09 |
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